- The type of cooling: 4-way spray. - Chuck type: push button. - Noise: ≤60dB. Air pressure at the back end of HP: - 0.25-0.28MPA (4 holes). - Bur applicable: Ø1.59-Ø1.6mmx21-23mm. - Rotation speed: ≥370,000rpm. The size of the head: - Ø12.5x14.8(torque head). - Ø11.5x14(standard head). **For further product information, please contact Chat Support**